Motor rotor and compressor

Abstract

The application provides a motor rotor and a compressor, wherein the motor rotor comprises a rotor core, a plurality of air holes and at least one sound attenuation cavity are arranged on the rotor core, the plurality of air holes are arranged around the axial direction of the rotor core and penetrate through opposite ends of the rotor core, and the sound attenuation cavity is arranged beside the air hole and is a closed columnar cavity; wherein the two ends of the columnar cavity are closed in the rotor core; or at least one end of the columnar cavity is an open end, and the open end is sealed by a component on the end face of the rotor core. In the motor rotor and the compressor provided in the application, by arranging the sound attenuation cavity on the rotor core and arranging the sound attenuation cavity as a closed columnar cavity, not only can the structural interference of the pump body caused by the arrangement of the sound attenuation cavity be avoided, but also the airflow noise of the compressor can be reduced, and the noise and vibration of the compressor can be effectively improved.

Description

Technical Field

[0001] This application relates to the field of compressor technology, and in particular to an electric motor rotor and a compressor. Background Technology

[0002] A compressor is a driven fluid machine that raises low-pressure gas to high-pressure gas. It is the heart of a refrigeration system. It draws in low-temperature, low-pressure refrigerant gas through the suction pipe, and uses the motor to drive the piston to compress the low-temperature, low-pressure refrigerant gas, and then discharges high-temperature, high-pressure refrigerant gas through the discharge pipe, thereby providing power for the refrigeration cycle.

[0003] Existing compressors generally include a housing, a motor assembly, and a pump assembly. The motor assembly and the pump assembly are driven together and are both housed within the housing. The motor assembly includes a stator and a rotor, with the rotor fixed to the stator via a shaft.

[0004] Currently, compressor operating noise is a key indicator of concern for both refrigeration product manufacturers and consumers. Low noise and low vibration have become an inevitable trend for compressors, and the market's requirements for compressor noise are increasing. Therefore, compressors typically incorporate a resonant silencing chamber in the pump body to reduce airflow noise.

[0005] However, due to the numerous screw holes, vent holes, rivet clearance holes, and countersunk holes for adjusting screws on the pump body, the space for setting up a resonant silencing cavity is very limited, and adding a resonant silencing cavity can easily cause structural interference. Summary of the Invention

[0006] In view of the deficiencies in the prior art, the purpose of this invention is to provide a motor rotor and a compressor that overcome the difficulties of the prior art and improves upon them. This not only improves airflow noise but also avoids structural interference caused by the installation of a resonance silencing cavity in the pump body.

[0007] According to one aspect of the present invention, an electric motor rotor is provided, the electric motor rotor comprising: a rotor core;

[0008] The rotor core is provided with multiple vent holes and at least one silencing cavity. The multiple vent holes are arranged around the axial direction of the rotor core and pass through the opposite ends of the rotor core. The silencing cavity is located next to the vent holes and is a closed cylindrical cavity.

[0009] Wherein, both ends of the cylindrical cavity are enclosed within the rotor core; or

[0010] At least one end of the cylindrical cavity is an open end, and the open end is sealed by a component on the end face of the rotor core.

[0011] Optionally, in the motor rotor, the components on the end face of the rotor core are rotor end plates and / or balance blocks.

[0012] Optionally, in the motor rotor, each of the silencing chambers communicates with at least one of the vent holes.

[0013] Optionally, in the motor rotor, a single vent hole communicates with multiple silencers.

[0014] Optionally, in the motor rotor, at least one connecting groove is provided between the silencing cavity and the vent hole, and the silencing cavity and the vent hole are interconnected through the connecting groove.

[0015] Optionally, in the motor rotor, the plurality of the communicating slots may have the same size or different sizes.

[0016] Optionally, in the motor rotor, each of the silencing cavities may have the same radial cross-section or different radial cross-sections.

[0017] Optionally, in the motor rotor, the plurality of the silencing cavities may have the same size or different sizes.

[0018] Optionally, in the motor rotor, the compressor is a constant-speed compressor, and the silencer cavity is twisted.

[0019] According to another aspect of the invention, a compressor is provided, the compressor comprising a motor rotor as described above.

[0020] In the motor rotor and compressor provided by the present invention, by opening a silencing cavity on the rotor core and setting the silencing cavity as a closed columnar cavity, not only can the structural interference caused by setting the silencing cavity in the pump body be avoided, but the airflow noise of the compressor can also be reduced, effectively improving the noise and vibration of the compressor. Attached Figure Description

[0021] The technical solution of the present invention will be described in detail below with reference to the accompanying drawings and specific embodiments, so that the characteristics and advantages of the present invention will become more apparent.

[0022] Figure 1 This is a schematic diagram of the lower end face of the rotor core according to an embodiment of the present invention;

[0023] Figure 2 This is a schematic diagram of the upper end face of the rotor core according to an embodiment of the present invention;

[0024] Figure 3 for Figure 1 Cross-sectional view along line A-A';

[0025] Figure 4 for Figure 1 Cross-sectional view along line B-B';

[0026] Figure 5 for Figure 3 Cross-sectional view along line C-C';

[0027] Figure 6 for Figure 3 Cross-sectional view along line D-D';

[0028] Figure 7 This is a schematic diagram of the rotor core structure according to another embodiment of the present invention;

[0029] Figure 8 This is a schematic diagram of the rotor core structure according to another embodiment of the present invention;

[0030] Figure 9 This is a cross-sectional view of the rotor core according to another embodiment of the present invention;

[0031] Figure 10 This is a schematic diagram of the cross-sectional structure of the rotor core in other embodiments of the present invention at a location without a noise-absorbing cavity and a noise-absorbing cavity channel;

[0032] Figure 11 This is a schematic diagram of the cross-sectional structure of the rotor core in another embodiment of the present invention at the location of the noise-absorbing cavity;

[0033] Figure 12 This is a schematic cross-sectional view of the rotor core in another embodiment of the present invention at the location having a noise-absorbing cavity and a noise-absorbing cavity channel;

[0034] Figure 13 for Figure 12 Cross-sectional view along line A-A';

[0035] Figure 14 for Figure 12 Cross-sectional view along line D-D'. Detailed Implementation

[0036] The embodiments of the present invention will be described in detail below. Although the present invention will be described and illustrated in conjunction with some specific embodiments, it should be noted that the present invention is not limited to these embodiments. On the contrary, any modifications or equivalent substitutions made to the present invention should be covered within the scope of the claims of the present invention.

[0037] Furthermore, to better illustrate the present invention, numerous specific details are set forth in the following detailed embodiments. Those skilled in the art will understand that the present invention can be practiced without these specific details. In other instances, well-known structures and components have not been described in detail in order to highlight the main points of the invention.

[0038] The technical solution of the present invention will be described in detail below with reference to the accompanying drawings and specific embodiments, so that the characteristics and advantages of the present invention will become more apparent.

[0039] Please refer to the reference. Figures 1 to 6 This is a schematic diagram of the rotor core structure according to an embodiment of the present invention. Figures 1 to 6 As shown, the motor rotor includes: a rotor core 10; the rotor core 10 has a plurality of vent holes 1 and at least one silencing cavity 4, the plurality of vent holes 1 are arranged around the axial direction of the rotor core 10 and pass through the opposite ends of the rotor core 10, the silencing cavity 4 is arranged next to the vent holes 1 and is a closed cylindrical cavity; wherein, both ends of the cylindrical cavity are closed in the rotor core 10; or at least one end of the cylindrical cavity is an open end, the open end is sealed by a component on the end face of the rotor core 10.

[0040] Specifically, a shaft hole (not shown in the figure) is provided at the central axis of the rotor core 10, and rivet holes 2 and magnet slots 3 are provided at the edge of the rotor core 10. Multiple vent holes 1 are provided between the rivet holes 2 and the shaft hole. Specifically, a countersunk hole concentric with the shaft hole is provided on one end face of the rotor core 10, forming a step between the countersunk hole and the shaft hole. The vent holes 1 are located on this step. The shaft hole, vent holes 1, rivet holes 2, and magnet slots 3 are all arranged around the axial direction of the rotor core 10 and pass through the opposite ends of the rotor core 10. The shaft hole is used to connect the motor shaft, the vent holes 1 facilitate oil-gas separation and refrigeration oil return, the rivet holes 2 are used to insert rivets to fix components of the motor rotor such as end plates and balance weights, and the magnet slots 3 are used to accommodate conductive strips (not shown in the figure).

[0041] The rotor core 10 is also provided with a noise reduction cavity 4. The noise reduction cavity 4 is located between the magnet slot 3 and the shaft hole and close to the vent hole 1. The noise reduction cavity 4 is a closed cylindrical cavity used to improve the airflow noise of the compressor.

[0042] In this embodiment, the silencing cavity 4 is located inside the rotor core 10, and both ends of the cavity are enclosed within the rotor core 10. That is, the two ends of the silencing cavity 4 do not extend to the opposite ends of the rotor core 10.

[0043] In other embodiments, one end of the silencing cavity 4 is enclosed within the rotor core 10, and the other end of the silencing cavity 4 is located on the end face of the rotor core 10 and is enclosed by a component on the end face of the rotor core 10. Alternatively, both ends of the silencing cavity 4 extend through opposite ends of the rotor core 10, and both ends of the silencing cavity 4 are enclosed by a component on the end face of the rotor core 10. That is, one or both ends of the silencing cavity 4 are open ends, and the open ends are enclosed by a component on the end face of the rotor core 10. The component on the end face of the rotor core 10 is a rotor end plate, a balance block, or a combination of a rotor end plate and a balance block.

[0044] In this embodiment, at least one connecting groove 5 is provided between the silencing cavity 4 and the vent hole 1, and the silencing cavity 4 can only communicate with the vent hole 1 through the connecting groove 5. In other embodiments, the connecting groove 5 may not be provided between the silencing cavity 4 and the vent hole 1, that is, the two are not interconnected.

[0045] In this embodiment, the silencing cavity 4 is a cylindrical cavity, and the axial direction of the silencing cavity 4 is consistent with the extending direction of the vent 1. The radial cross-section (i.e., the cross-sectional area) of the silencing cavity 4 is circular and has the same size. In another embodiment, the radial cross-section of the silencing cavity 4 is circular, but the area of ​​the radial cross-section can gradually increase or decrease along the axial direction of the silencing cavity 4. In other embodiments, the cross-section of the silencing cavity 4 can also be of other shapes, and its cross-sectional shape and size can be the same or different.

[0046] In this embodiment, the rotor core 10 has only one silencing cavity 4, and the silencing cavity 4 is connected to only one vent hole 1. In other embodiments, the rotor core 10 may have two, three, or more silencing cavities 4, with a single vent hole 1 connected to at least one silencing cavity 4, and a single silencing cavity 4 may also be connected to at least one vent hole 1. That is, at least one of the plurality of vent holes 1 is connected to the silencing cavity 4, a single vent hole 1 may be connected to multiple silencing cavities 4, and multiple vent holes 1 may also share a single silencing cavity 4.

[0047] like Figure 7 As shown, the rotor core 10 has two silencing cavities 4, which are located on opposite sides of one of the vent holes 1 and are connected to the vent hole 1 via connecting grooves 5. Figure 8 As shown, a silencing cavity 4 is provided on the rotor core 10. This silencing cavity 4 is located between two vent holes 1 and is connected to the two vent holes 1 through a connecting groove 5.

[0048] In this embodiment, only one connecting groove 5 is provided between the silencing cavity 4 and the vent 1. In other embodiments, two, three, or more connecting grooves 5 may also be provided between the silencing cavity 4 and the vent 1. Figure 9 As shown, two connecting grooves 5 are provided between the silencing cavity 4 and the vent hole 1, and the silencing cavity 4 and the vent hole 1 are interconnected through these two connecting grooves 5.

[0049] In this embodiment, the silencing cavity 4 is vertically arranged, and the connecting groove 5 is horizontally arranged.

[0050] It should be noted that the cross-sectional shape, size, and axial height of the silencing cavity 4 and the connecting groove 5 can be set according to actual needs. When there are two or more silencing cavities 4, the cross-sections of the silencing cavities 4 can be the same or different, and the axial heights of the silencing cavities 4 can be the same or different. The cross-section of the connecting groove 5 can be the same or different from that of the silencing cavity 4. When there are multiple connecting grooves 5, the axial heights of the connecting grooves 5 can be the same or different.

[0051] Preferably, the plurality of vent holes 1 are evenly distributed along the circumference of the rotor core 10, the axial height of each silencing cavity 4 is equal, and the axial height of each connecting groove 5 is equal.

[0052] Preferably, the rotor core 10 is formed by stacking multiple rotor laminations (not shown in the figure) from top to bottom.

[0053] In this embodiment, the silencing cavity 4 is vertical. In other embodiments, the silencing cavity 4 may be twisted, and the motor rotor is used for a constant-speed compressor.

[0054] Please refer to the reference. Figures 10 to 14 This is a schematic diagram of the rotor core structure in other embodiments of the present invention. Figures 10 to 14 As shown, in other embodiments, the rotor core may be composed of laminations twisted and riveted, and the silencing cavity 4 of the rotor core is inclined relative to the axial direction of the rotor core, and is twisted.

[0055] Accordingly, this embodiment also provides a compressor, which includes the motor rotor as described above. Please refer to the above text for details, which will not be repeated here.

[0056] When the refrigerant discharged from the compressor pump body passes through the vent hole 1 of the rotor core 10, the silencing cavity 4 on the rotor core 10 can reduce airflow noise.

[0057] In the compressor provided in this embodiment, since the silencing cavity is located on the motor rotor rather than on the pump body, structural interference caused by the silencing cavity on the pump body can be avoided.

[0058] In summary, the motor rotor and compressor of the present invention, by opening a silencing cavity on the rotor core and setting the silencing cavity as a closed cylindrical cavity, can not only avoid structural interference caused by the silencing cavity in the pump body, but also reduce the airflow noise of the compressor, effectively improving the noise and vibration of the compressor.

[0059] The above description, in conjunction with specific preferred embodiments, provides a further detailed explanation of this application and should not be construed as limiting the specific implementation of this application to these descriptions. For those skilled in the art, various simple deductions or substitutions can be made without departing from the concept of this application, and all such modifications or substitutions should be considered within the scope of protection of this application.

Claims

1. A motor rotor, characterized in that, include: Rotor core; The rotor core is provided with multiple vent holes and at least one silencing cavity. The multiple vent holes are arranged around the axial direction of the rotor core and pass through the opposite ends of the rotor core. The silencing cavity is located next to the vent holes and is a closed cylindrical cavity. Wherein, both ends of the cylindrical cavity are enclosed within the rotor core; or At least one end of the cylindrical cavity is an open end, and the open end is sealed by a component on the end face of the rotor core. Each vent hole is connected to multiple silencing chambers, and a silencing chamber is provided on each of the opposite sides of the vent hole; at least one connecting groove is provided between the silencing chamber and the vent hole, and the silencing chamber and the vent hole are connected to each other through the connecting groove.

2. The motor rotor as described in claim 1, characterized in that, The components on the end face of the rotor core are rotor end plates and / or balance blocks.

3. The motor rotor as described in claim 1, characterized in that, Each of the silencing chambers is in communication with at least one of the vent holes.

4. The motor rotor as described in claim 1, characterized in that, The multiple connecting slots may have the same size or different sizes.

5. The motor rotor as described in claim 1, characterized in that, Each of the silencing cavities may have the same radial cross section or different radial cross sections.

6. The motor rotor as described in claim 1, characterized in that, The plurality of said silencing cavities may have the same size or different sizes.

7. A compressor, characterized in that, include: The motor rotor as described in any one of claims 1 to 6.

8. The compressor as claimed in claim 7, characterized in that, The compressor is a constant-speed compressor, and the silencer chamber is twisted.

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